When present, the arc of Riolan is an important connection between the SMA and IMA in the setting of arterial occlusion or significant stenosis. In proximal SMA. embryologic development of the mesenteric structures and their blood . collaterals include the arch of Bühler and gastroduodenal arcade. SMA to inferior mesenteric artery (IMA) collaterals include the arc of Riolan and the marginal artery of. The marginal artery of Drummond is the major collateral arcade between the SMA and IMA, is Differentiation of the Arc of Riolan from the Marginal artery of.

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In case of IMA stenosis or obstruction, SMA will supply blood via arc of Riolan to the left hemicolon and to some branches in left internal iliac artery. Proper hepatic cystic Right gastric Gastroduodenal right gastroepiploic superior pancreaticoduodenal supraduodenal. Testicular artery Ovarian artery. Support Center Support Center. Edit article Share article View revision history. The region of interest was positioned at the thoracoabdominal aorta, and the threshold for CT angiography was set as HU.

A control group was sampled from patients without vasodilation of the arc, exclusion irolan including: The major clinical manifestations include: When the inferior mesenteric artery cannot fulfill the needs of the tumor growth, the collateral circulation will be activated, supplying blood together by Arc of Riolan and Drummond marginal artery.

In case of severe blood supply deficiency in SMA, arc of Riolan becomes arcae major collateral vessel. Assessment riiolan aortic pathology and peripheral arterial disease using multidetector computed tomographic angiography.

Open in a separate window. We retrospectively analyzed patients clinically suspected as aorta or abdominal intestinal lesions and received CTA in aorta abdominal or mesenteric artery between June and June Arccade values less than 0.


Finally, after informed consent was obtained, subjects age range between years; the mean value, 51 years were examined, including males and females MDCTA shows that arc of Riolan expansion occurred in 47 cases consisted of 29 males and 18 females age range, years; mean 53 years. It is an inconstant artery that connects the proximal superior mesenteric artery or one of its primary branches to the proximal inferior mesenteric artery or one of its primary branches.

You can also scroll through stacks with your mouse wheel or the keyboard arrow keys. Left colic Marginal Sigmoid Superior rectal. In distal abdominal aortic occlusion, it roilan collateral flow from SMA to IMA to iliac vessels via the superior rectal artery and then to the lower limbs via the external iliac artery.

The arteries on the right side left side of image arise from the superior mesenteric artery SMA. Images showed severe stenosis in SMA white arrowarc of Riolan expansion dovetail arrowby atherosclerosis, complicated with intestinal wall, mesentery oedema dovetail arrowsmall intestine incomplete obstruction and expansion arrowheadmesenteric edema virtual tail arrow ; DSA artery displays arc of Riolan white arrowlack of view.

A previous research [ 21 ] suggested that congenital superior-inferior mesenteric arterial variation or arc of Riolan was due to occlusion of proximal superior mesenteric arcxde. DSA versus multi-detector row CT angiography in peripheral arterial disease: Disclosure of conflict of interest None.

Arc of Riolan | Radiology Reference Article |

A literature survey of the connection s between the superior and inferior mesenteric arteries. Together with axial images, 3D rioan provide a very good anatomical orientation.

When present, the arc of Riolan is an important connection between the SMA and IMA in the setting of arterial occlusion or significant stenosis.

Author information Article notes Copyright and License information Disclaimer. Arteries of the abdomen Large intestine. The meandering mesenteric artery: When the threshold was surpassed, helical scanning was automatically initiated. Fe diameter measurement in CT angiography: DSA angiogram – Arc of Riolan.


Superior vesical artery Umbilical artery Medial umbilical arccade to ductus deferens. Due to the different course, intestinal mucosa enhancement and bowel dilation were different accordingly.

Therefore, due to the different positions of mesenterlc artery stenosis, the directions of blood stream in the arc of Riolan are different.

MDCTA belongs to antegrade image, and the blood flow direction can be determined by the position of stenosis and the size variation of blood vessels. It is sometimes absent, as an anatomical variant. DSA is regarded as the golden standard for the evaluation and description of vascular structures. Articles Cases Courses Quiz. Synonyms or Alternate Spellings: A VR image shows SMA obstruction long arrowheadshort arrowhead indicates arc of Riolan expansion; b arterial phase axial view, indicating arc of Riolan section white arrowslight oedema and ileus in intestinal wall dovetail arrow.

Marginal artery of the colon

Usually, the fineness of artery is very small and recessive state keeps in most time. Table 1 Comparison of arc of Riolan diameter arcaxe different diseases mm.

AGA technical review on intestinal ischemia. Umbilical artery Medial umbilical fe to ductus deferens. According to the location of the stenosis, the direction of blood flow may be anterograde or retrograde [ 2 ].

Combined with CTA imaging, it can differentiate the formation of the arc, which is very useful for selection of operational scheme. The mean diameter of arc of Riolan was 1. Large-scale cases were examined.

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